Id try running it very shortly with the fan belt off.. If it still makes the noise it MIGHT be the fly wheel has come loose... But, if it still makes the noise when the fan belt is off Id drain the oil and look for metal shiney bits first.

Id try running it very shortly with the fan belt off.. If it still makes the noise it MIGHT be the fly wheel has come loose... But, if it still makes the noise when the fan belt is off Id drain the oil and look for metal shiney bits first.

How is the end play?
Mine sounded like that and I thought the same thing. Tore it down and found out the cam gear was being chewed up, causing the knock._________________1973 SB 1776cc
Sat from 93-2008
Work in progress.
WTF?? https://www.youtube.com/watch?v=mcDgOGC5Lcc

That's the engine tin hitting the inside of the crank pulley, Needs a slight tweak with a long flat blade screwdriver. Stop the engine and place the screwdriver on the right side and behind the pulley and shove the tin back a little more. It could make it worse but you will figure out which way to move it through trial and error._________________1971 VW Sundial Camper with a Type 1 1800cc engine built in 2013.
Type 1 1800cc with Web-Cam 118 and L3 heads built in 2015 and Stock-ish 1679cc engine 2016.

That's the engine tin hitting the inside of the crank pulley, Needs a slight tweak with a long flat blade screwdriver. Stop the engine and place the screwdriver on the right side and behind the pulley and shove the tin back a little more. It could make it worse but you will figure out which way to move it through trial and error.

This could cause that knocking noise? Or are you talking about the constant rubbing wine?_________________(Owner) www.vintagecarleds.com

The whine or screech sound, perhaps that's just the whistle of the exhaust or the whine of the fan belt.
I just listened to mine here: Cold Start, it's a little clunky but I think it's just the fan belt slapping around. Belt sounds will tend to clear up if you squirt water on the belt. Looks like I need to adjust my fan belt. My engine clucks a little bit which I thinks may be due to a small amount of end-play in the crankshaft, I am not worried about it but will rebuild it before another 12000 miles._________________1971 VW Sundial Camper with a Type 1 1800cc engine built in 2013.
Type 1 1800cc with Web-Cam 118 and L3 heads built in 2015 and Stock-ish 1679cc engine 2016.